A couple of quick ideas: one side must escort a VIP to a destination on the board (to facilitate this, people may redshirt themselves for the VIP). Or an escalation game wherein each player has maybe 3 units present at the start of the game, and each turn D3 units arrive from a random board edge. Maybe even a deathrace, where you must do X laps around a track, but brikwarsy violence is allowed (a good time to use the rules for constructing things mid-battle like upgraded weapons and repairing damage).